I think most problems with reqoutes can be solved by having a VPS located close to your preferred brokers server. Instaforex's servers are placed in Singapore (2 datacenters) and USA (5 datacenters).
Get the IP address of the servers and ping them, some VPS-hosts provide ping-times to various brokers servers as well.
From my position (Denmark) my pingtimes to Instaforex servers are:
In my case, no need for VPS, I think <40ms is adequate for forextrading.